การศึกษาผลของการพาความร้อนต่อการก่อตัวของน้ำแข็งด้วยระเบียบวิธีเชิงตัวเลข / เทิดธรรม อนันตศรษฐ = A study of heat convection effect on ice formation by numerical method / Therdtham Anuntasate
This thesis presents a study of heat convection effect on ice formation by a numerical method. The commercial program FLUENT is used to simulate the problem. The content of this thesis are divided into three main parts. The first consist of the problem background, motivation and a review of related studies. The second part describes related theories and the use of finite volume - based FLUENT software. Basic fluid dynamics conservation equations are the governing equations while enthalpy – porosity method is used for the solidification. The model uses the pressure – based solver, power – law scheme, green – gauss cell – based gradient and first order implicit temporal scheme. The last part of the thesis concern with the validation of the software. For ice formation without convection, the simulation results show the same trend as exact and validated numerical solution form previous research. The highest error occurs near the edge and at phase change interface due to high temperature gradient and the calculation of latent heat. For ice formation with convection, limitation of FLUENT software shown up since there exists the mushy zone despite the fact that water phase change is distinct.